我將jsp處理xml必須的兩個庫文件放在了tomcat的lib文件夾下面：

• xalan.jar
• xercesImpl.jar

啟動tomcat時遇到如下警告消息：

Jul 17, 2020 4:48:18 PM org.apache.tomcat.util.scan.StandardJarScanner processURLs WARNING: Failed to scan [file:/C:/MyApp/apache-tomcat-9.0.29/lib/serializer.jar] from classloader hierarchy java.io.FileNotFoundException: C:\MyApp\apache-tomcat-9.0.29\lib\serializer.jar (The system cannot find the file specified)at java.util.zip.ZipFile.open(Native Method)at java.util.zip.ZipFile.<init>(ZipFile.java:219)at java.util.zip.ZipFile.<init>(ZipFile.java:149)at java.util.jar.JarFile.<init>(JarFile.java:166)at java.util.jar.JarFile.<init>(JarFile.java:130)at org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:177)at org.apache.tomcat.util.scan.JarFileUrlJar.<init>(JarFileUrlJar.java:65)at org.apache.tomcat.util.scan.JarFactory.newInstance(JarFactory.java:49)at org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java:374)at org.apache.tomcat.util.scan.StandardJarScanner.processURLs(StandardJarScanner.java:309)at org.apache.tomcat.util.scan.StandardJarScanner.doScanClassPath(StandardJarScanner.java:266)at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:229)at org.apache.catalina.startup.ContextConfig.processJarsForWebFragments(ContextConfig.java:1968)at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1128)at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:774)at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:301)at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5051)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)at java.util.concurrent.FutureTask.run(FutureTask.java:266)at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)at java.util.concurrent.FutureTask.run(FutureTask.java:266)at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.startup.Catalina.start(Catalina.java:633)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:497)at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:343)at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:474)

我在下載xalan.jar的壓縮包里找到了StandardJarScanner processURLs尋找的serializer.jar:
http://xml.apache.org/xalan-j/index.html

把它復制到tomcat安裝文件夾的lib下面，問題解決了。

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